Sometimes students may encounter complex quadratics factorise involving \( x^2, y^2, xy, x \) and \( y \). Consider factorising by only either \( x \) or \( y \). The following examples take through factorising \( y \) first, then \( x\). Example 1 Factorise \( x^2 + 2xy + 5x + y^2+ 5y […]
